Wireless ECG Monitoring
System
Dina Simunic, Slaven Tomac, Ivan Vrdoljak
University of Zagreb, Faculty of Electrical Engineering and
Computing
Unska 3, 10000 Zagreb, Croatia
* Centar za telemedicinu d.o.o.
Prilaz Gj. Dezelica 59, 10000 Zagreb, Croatia
Adviser: Hung-Chi Yang
Speaker: Yu-Ming Chen
2010/9/30
1
Outline
Introduction
Products
Conclusion
2
Introduction
Telemedicine：Communications and information technologies
Basis of two concepts：1.Real time (synchronous)
2.Store-and-forward (asynchronous)
Telehealth：1.Preventive
2.Promotive
3.Curative aspects
3
Introduction
Store
Forward
Purpose
● The wireless cardiac monitoring system allows patients to be
monitored continuously for an extended, unlimited period and has
been effective in the diagnosis of clinically significant, symptomatic,
and asymptomatic cardiac arrhythmias.
Furthermore, the technology has the potential to reduce patient
error, enhance diagnostic accuracy, decrease time to diagnosis, and
improve patient care.
5
Products
1. Classical Ambulatory Cardiac Monitoring System
2. Wireless Cardiac Monitoring System
Typical cardiac pacemaker battery pack
size (in millimeters).
6
Classical Ambulatory
※Holter monitoring
※Cardiac event monitor
※Continuous loop recorder
※Holter monitoring
EFFECTIVE ELECTRICAL PARAMETERS
OF DIFFERENT SUBSTRATES ANDSUPERSTRATES(
POWER IS GIVEN AT 1 m WHEN MAX 1-g SAR = 1.6W/kg
8
※Cardiac event monitor
9
※Continuous loop recorder
10
Wireless Cardiac Monitoring System
11
Properties
1.
2.
3.
4.
(a)
Lightweight,
High mobility
Wireless transmission
Low power
(b)
12
(a)
(b)
13
Application
1. At home
2. In hospital
(a)
14
Bluetooth ECG samples data
1.
2.
3.
4.
5.
6.
7.
8.
600 Hz, with A/D 12 bit resolution
Frequency range 0.05-100 Hz (-3dB)
Dynamic range 16 Mv
DC offset tolerance +/- 300 Mv
Input impedance 100 MOhm
Storage frequency 600 Hz, 300 Hz or 150 Hz
Memory capacity from 8to 60 minutes
Up to 3 independent bipolar or 5 independent unipolar ECG
channels.
15
The protocol consists of three phases
1. The Bluetooth connects the ECG-monitor and the computer,
whereas the ECG-monitor sends confirmation of the realized
connection with a dedicated frame.
2. Real-time monitoring mode
3. Take out of the total data (including sync) the «useful» data
16
Framework Structure
Sync
Length
Command
Data to trasmit
Cheksum
17
Data Sets
ID
0
Description
System information
1
2
222
255
Schedule
ECG data
Index file
Real time data
PERMITTIVITIES AND CONDUCTIVITIES FOR TISSUES
OF THE REALISTIC SHOULDER AT 433 MHz FROM
18
Bluetooth Connection
Event Possible Bluetooth Retrieval
Active Bluetooth
mode
Wireless ECG Technology Interface
Wireless ECG Technology Security
1.
Every Bluetooth device has unique IEEE MAC address
(48bits)
2. Frequency Hopping Spread Spectrum is being applied
with low transmitter power
3. Bluetooth security protocol requires 2 secret keys:
a. authentication key (128-bits)
b. encription key (8-128-bits)
Conclusion
在日常生活中，無線心電監護系統，不僅可以用在家裡，
也可以用在臨床監測或救護車。因此，在運送病人時它也
無需分離或重新附加導線。這真是一個方便的ECG監測儀
器。
23
Thank you For your attention
24